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Net Income per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to AXT, Inc | $ (311)us-gaap_NetIncomeLoss | $ 644 us-gaap_NetIncomeLoss | $ 319 us-gaap_NetIncomeLoss | $ (2,040)us-gaap_NetIncomeLoss | $ (1,228)us-gaap_NetIncomeLoss | $ (2,295)us-gaap_NetIncomeLoss | $ (2,035)us-gaap_NetIncomeLoss | $ (2,400)us-gaap_NetIncomeLoss | $ (1,388)us-gaap_NetIncomeLoss | $ (7,958)us-gaap_NetIncomeLoss | $ 3,110 us-gaap_NetIncomeLoss
Less: Preferred stock dividends |  |  |  |  |  |  |  |  | (177)us-gaap_PreferredStockDividendsIncomeStatementImpact | (177)us-gaap_PreferredStockDividendsIncomeStatementImpact | (177)us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income (loss) to common stockholders |  |  |  |  |  |  |  |  | $ (1,565)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (8,135)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 2,933 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares (basic) |  |  |  |  |  |  |  |  | 32,452 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 32,700 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 32,144 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of Dilutive Securities on Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares (dilutive) |  |  |  |  |  |  |  |  | 32,452 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 32,700 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 32,865 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net income (loss) per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to AXT, Inc (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.05)axti_EarningPerShareBasicAttributableToParent | $ (0.25)axti_EarningPerShareBasicAttributableToParent | $ 0.10 axti_EarningPerShareBasicAttributableToParent
Net income to common stockholders (in dollars per share) | $ (0.01)us-gaap_EarningsPerShareBasic | $ 0.02 us-gaap_EarningsPerShareBasic | $ 0.01 us-gaap_EarningsPerShareBasic | $ (0.06)us-gaap_EarningsPerShareBasic | $ (0.04)us-gaap_EarningsPerShareBasic | $ (0.07)us-gaap_EarningsPerShareBasic | $ (0.06)us-gaap_EarningsPerShareBasic | $ (0.08)us-gaap_EarningsPerShareBasic | $ (0.05)us-gaap_EarningsPerShareBasic | $ (0.25)us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic
Diluted net income (loss) per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to AXT, Inc (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.05)axti_EarningPerShareDilutedAttributableToParent | $ (0.25)axti_EarningPerShareDilutedAttributableToParent | $ 0.09 axti_EarningPerShareDilutedAttributableToParent
Net income to common stockholders (in dollars per share) | $ (0.01)us-gaap_EarningsPerShareDiluted | $ 0.02 us-gaap_EarningsPerShareDiluted | $ 0.01 us-gaap_EarningsPerShareDiluted | $ (0.06)us-gaap_EarningsPerShareDiluted | $ (0.04)us-gaap_EarningsPerShareDiluted | $ (0.07)us-gaap_EarningsPerShareDiluted | $ (0.06)us-gaap_EarningsPerShareDiluted | $ (0.08)us-gaap_EarningsPerShareDiluted | $ (0.05)us-gaap_EarningsPerShareDiluted | $ (0.25)us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Securities excluded from diluted net income per share as the impact is anti-dilutive (in shares) |  |  |  |  |  |  |  |  | 252 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 241 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 13 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Options [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Securities excluded from diluted net income per share as the impact is anti-dilutive (in shares) |  |  |  |  |  |  |  |  | 2,772 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 2,671 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 1,056 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember
Common stock options [Member] |  |  |  |  |  |  |  |  |  |  |
Effect of Dilutive Securities on Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities (in shares) |  |  |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_EmployeeStockOptionMember | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_EmployeeStockOptionMember | 689 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_EmployeeStockOptionMember
Restricted stock [Member] |  |  |  |  |  |  |  |  |  |  |
Effect of Dilutive Securities on Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities (in shares) |  |  |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_RestrictedStockMember | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_RestrictedStockMember | 32 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_StatementClassOfStockAxis = us-gaap_RestrictedStockMember

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